How is a ZIMM bevel gearbox of the ZK Series designed?

The design of a ZIMM bevel gearbox of the ZK Series is based on torque, speed and power at the input and output. In addition, the operating factor, temperature factor, speed factor and duty factor are included. For gearbox selection, design torque, design power and thermal limit power are calculated. A breather is required from 80% of the thermal limit power. Which input variables are required for the design of a ZIMM bevel gearbox of the ZK Series? The following variables are used for the design of a ZIMM bevel gearbox of the ZK Series: Symbol Meaning Unit T D Input torque Nm P D Input power kW n D Input speed min⁻¹ T AC Output torque Nm P AC Output power kW n AC Output speed min⁻¹ i Drive ratio – η Gearbox efficiency – T AC;n Output torque of a load case Nm n AC;n Output speed of a load case min⁻¹ t n Time share of a load case min⁻¹ T a;AC Design torque at the output Nm P a Design power at the gearbox kW P t Thermal limit power kW f b Operating factor – f t Temperature factor – f d Speed factor – f e Duty factor – In which steps is a ZIMM bevel gearbox of the ZK Series designed? The design of a ZIMM bevel gearbox of the ZK Series is carried out in a calculation sequence: Calculate the input torque at shaft D. Calculate the output torque at shaft A or C. Calculate the output speed. Calculate the output power. Determine the operating factor, temperature factor, speed factor and duty factor. Calculate the design torque at the output. Calculate the design power at the gearbox. Calculate the thermal limit power. Compare the calculated values with the permissible table values. Check whether a breather is required from 80% of the thermal limit power.

Design of ZIMM ZK Series bevel gearboxes

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Author:

Jonathan Mildner | Head of Sales Technology

Last modified:

26.05.2026

The design of a ZIMM bevel gearbox of the ZK Series is based on torque, speed and power at the input and output. In addition, the operating factor, temperature factor, speed factor and duty factor are included. For gearbox selection, design torque, design power and thermal limit power are calculated. A breather is required from 80% of the thermal limit power.

Which input variables are required for the design of a ZIMM bevel gearbox of the ZK Series?

The following variables are used for the design of a ZIMM bevel gearbox of the ZK Series:

Symbol	Meaning	Unit
T_D	Input torque	Nm
P_D	Input power	kW
n_D	Input speed	min⁻¹
T_AC	Output torque	Nm
P_AC	Output power	kW
n_AC	Output speed	min⁻¹
i	Drive ratio	–
η	Gearbox efficiency	–
T_AC;n	Output torque of a load case	Nm
n_AC;n	Output speed of a load case	min⁻¹
t_n	Time share of a load case	min⁻¹
T_a;AC	Design torque at the output	Nm
P_a	Design power at the gearbox	kW
P_t	Thermal limit power	kW
f_b	Operating factor	–
f_t	Temperature factor	–
f_d	Speed factor	–
f_e	Duty factor	–

In which steps is a ZIMM bevel gearbox of the ZK Series designed?

The design of a ZIMM bevel gearbox of the ZK Series is carried out in a calculation sequence:

Calculate the input torque at shaft D.
Calculate the output torque at shaft A or C.
Calculate the output speed.
Calculate the output power.
Determine the operating factor, temperature factor, speed factor and duty factor.
Calculate the design torque at the output.
Calculate the design power at the gearbox.
Calculate the thermal limit power.
Compare the calculated values with the permissible table values.
Check whether a breather is required from 80% of the thermal limit power.

Jonathan Mildner | Head of Sales Technology

Jonathan Mildner heads the Sales Technology department at ZIMM. He is responsible for the design and safe integration of screw jacks, electromechanical actuators, and drive technology – including accessories from the ZIMM modular system, clearly defined interfaces, the safety concept, and complete documentation; he provides technical support for manufacturing to drawing (special parts/adaptations).

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